AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
Description
Pin Assignments
NEW PRODUCT
The AL3158 is a low noise, constant frequency charge pump
DC/DC converter that uses a Dual mode load switch (1x), and (2x)
conversion for white LED applications. The AL3158 is capable of
driving three groups of three LED channels at 20mA from a 2.7V to
5.5V input. The current sinks may be operated using three simple
PWM dimming inputs individually or in parallel for driving highercurrent LEDs. Low external part counts (one 1µF flying capacitor
and two 2.2µF capacitors at VIN and VOUT) make this part ideally
suited for small, battery-powered applications.
AL3158 PWM dimming inputs are used to enable, disable device
and dimming LED current with a fixed default current settings at
20mA or other factory programming options available.
Each output of the AL3158 is equipped with built-in protection for
VOUT short circuit and auto-disable for LED short conditions. Built-in
soft-start circuitry prevents excessive inrush current during start-up
and mode switching. A low-current shutdown feature disconnects
the load from VIN to reduce quiescent current less than 1µA.
The AL3158 is available in a lead-free, space-saving, thermally
enhanced 20-pin 3 x 3mm QFN package.
Applications
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
VIN Range: 2.7V to 5.5V
Up to 93% Max Power Efficiency
1% Current Matching Accuracy Between Channels
Three simple PWM dimming for RGB or WLED
Low transition threshold voltage typical 150 mV
Dual-Mode 1x and 2x Charge Pump
Drives up to 3 + 3 + 3 Channels of LEDs
1.2 MHz Constant Switching Frequency
VOUT short circuit and Thermal Protections
Soft Start for reducing inrush current
Under Voltage Lockout Protection
IQ <1µA in Shutdown
Thermally-Enhanced QFN3030-20 Package: Available in “Green”
Molding Compound (No Br, Sb)
Lead Free Finish/ RoHS Compliant (Note 1)
Notes:
Mobile Phone White LED Backlighting and Indicators
PDA White LED Backlighting
Battery-operated Phone Main and Sub Screen White LED
Backlighting
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html
Typical Application Circuit
8
VIN
VIN
CP
2.2uF
CIN
CN
AL3158
VOUT
9
1uF
C1
7
EN2
3
5
D1
D2
D3
D4
EN1
EN2
EN3
EN2
11
D1
LED
EN1
EN1
D2
LED
D3
LED
D4
LED
D5
LED
D6
LED
D7
LED
D8
LED
D9
LED
2.2uF
COUT
12
13
14
15
D5 16
EN3
4
D6 18
EN3
20
PGND
6
AL3158
Document number: DS35047 Rev. 2 - 2
D7
1
D8
2
D9
GND
17
1 of 10
www.diodes.com
January 2011
© Diodes Incorporated
AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
NEW PRODUCT
Pin Descriptions
Pin Name
D8
D9
EN1
EN3
EN2
PGND
CN
VIN
CP
NC
Pin Number
1
2
3
4
5
6
7
8
9
10,19
VOUT
11
D1
D2
D3
D4
D5
D6
GND
D7
GND
12
13
14
15
16
18
17
20
EP PAD
Description
Current sink input #8. Connected to VOUT when un-used.
Current sink input #9. Connected to VOUT when un-used.
Enable Pin 1
Enable Pin 3
Enable Pin 2
Charge Pump Switch Ground
Negative Terminal of Flying Capacitor
Input Power Supply. Requires 2.2µF capacitor between this pin and ground.
Positive Terminal of Flying Capacitor
No-Connect
Charge pump output to drive load circuit. Requires 2.2µF capacitor between this pin
and ground.
Current sink input #1. Connected to VOUT when un-used.
Current sink input #2. Connected to VOUT when un-used.
Current sink input #3. Connected to VOUT when un-used.
Current sink input #4. Connected to VOUT when un-used.
Current sink input #5. Connected to VOUT when un-used.
Current sink input #6. Connected to VOUT when un-used.
Ground
Current sink input #7. Connected to VOUT when un-used.
Exposed Pad (bottom). Connected to GND directly underneath the package.
Functional Block Diagram
AL3158
Document number: DS35047 Rev. 2 - 2
2 of 10
www.diodes.com
January 2011
© Diodes Incorporated
AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
Absolute Maximum Ratings (Note 2)
NEW PRODUCT
Symbol
ESD HBM
ESD MM
VIN
VEN1,2,3
IOUT
TJ
TLEAD
Notes:
Description
Human Body Model ESD Protection
Machine Model ESD Protection
Input Voltage
EN1, EN2, EN3 to GND Voltage
Maximum DC Output Current
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
Rating
2
200
-0.3 to 6
-0.3 to VIN +0.3
270
150
300
Unit
KV
V
V
V
mA
°C
°C
2. Exceeding Absolute Maximum Ratings will cause permanent damage to the device.
Recommended Operating Conditions
Symbol
Min
Max
VIN
Input Voltage
Parameter
2.7
5.5
V
TA
Operating Ambient Temperature
-40
85
°C
Electrical Characteristics (TA = 25°C, Vin = 3.6V,
Symbol
IQ
ISHDN
IDX
ID-Match
Parameter
Quiescent Current
Shutdown Current
ISINK Current Accuracy (Note 3)
Current Matching Between Any Two
Current Sink Inputs (Note 4)
Unit
CIN = COUT = 2.2µF, C1 = 1µF Unless otherwise noted)
Test Conditions
1x Mode, 3.0≤VIN≤5.5, Active,
No Load Current
2x Mode, 3.0≤VIN≤5.5, Active,
No Load Current
EN1, EN2, EN3 = 0
Min
Typ.
Max
0.3
0.6
2
5
20
1
21
µA
mA
1
2
%
mA
19
VF: D1:D9 = 3.6V
1x mode
0.5
2 x mode
4.5
Rout
Open Loop VOUT Resistance
VTH
1x to 2x Transition Threshold at Any
IDX = 20mA
ISINK Pin
Unit
Ω
150
mV
VHS
Mode Transition Hysteresis
250
mV
TSS
Fsw
Soft-Start Time
Switching Frequency
EN1,2,3 Threshold Low
EN1,2,3 Threshold High
EN1,2,3 Off Timeout
VIN Under-Voltage Lockout
EN1,2,3 Input Leakage
Thermal shutdown Protection
Thermal shutdown hysteresis
Thermal Resistance Junction-toAmbient
100
1.2
µs
MHz
V
V
ms
V
µA
°C
°C
VEN1, 2,3 (L)
VEN1,2,3(H)
TEN1,2,3
UVLO
IEN1,2,3
TSHDN
THYS
θJA
VIN = 2.7V
VIN = 5.5V
0.4
1.4
1.8
-1
2
160
10
QFN3030-20 (Note 5)
52
20
2.2
1
o
C/W
Notes: 3. Determined by the average current levels of all active channels.
4. Determined by the maximum sink current (MAX), the minimum sink current (MIN), and the average sink current (AVG). Two matching numbers are
calculated as (MAX-AVG)/AVG and (AVG-MIN)/AVG. The largest number of the two (worst case) is considered as the matching data.
5. Device mounted on FR-4 substrate, 2"*2", 2oz copper, double-sided PC board, with minimum recommended pad on top layer and
4 vias to bottom layer.
AL3158
Document number: DS35047 Rev. 2 - 2
3 of 10
www.diodes.com
January 2011
© Diodes Incorporated
AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
Typical Performance Characteristics
NEW PRODUCT
Turn-On to 1x Mode
Turn-On to 2x Mode
EN1,2,3
2V/div
EN1,2,3
2V/div
Vout
2V/div
Vout
2V/div
Cp
2V/div
Cp
2V/div
Iin
200mA/div
VIN=4.2V
TA=25°C
IL=20mA
Iin
200mA/div
VIN=3.0V
TA=25°C
IL=20mA
50us/div
100us/div
Turn-Off from 1x Mode
Turn-Off from 2x Mode
VIN=4.2V
TA=25°C
IL=20mA
VIN=3.0V
TA=25°C
IL=20mA
EN1,2,3
2V/div
EN1,2,3
2V/div
Vout
2V/div
Vout
2V/div
Cp
2V/div
Cp
2V/div
Iin
200mA/div
Iin
200mA/div
200ms/div
200ms/div
Load Characteristics in 2x Mode
PWM Dimming Control (Duty Cycle=50%)
Vin
200mVAC/div
EN
3.6V/div
Idx
50mA/div
VIN=3.0V
TA=25°C
IL=20mA
Vout
200mVAC/div
Iin
100mAAC/div
VIN=3.6V
Freq=20kHz
Duty Cycle=50%
Document number: DS35047 Rev. 2 - 2
Iin
100mA/div
10us/div
1us/div
AL3158
TA=25°C
4 of 10
www.diodes.com
January 2011
© Diodes Incorporated
AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
Typical Performance Characteristics (Continued)
Channels 1 to 9
NEW PRODUCT
VF=3.1V
TA=25°C
IL=20mA
VIN=3.6V
Channels 1 to 9
VIN=3.6 V
TA=25°C
VEN(H)
VEN(L)
VIN=3.6V
AL3158
Document number: DS35047 Rev. 2 - 2
5 of 10
www.diodes.com
VIN=2.7V
January 2011
© Diodes Incorporated
AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
Functional Description
NEW PRODUCT
The AL3158 is a dual-mode high efficiency charge pump
(1x and 2x) device, driving three groups of three LED
channels at 30mA maximum each, intended for white LED
backlight applications. An internal comparator circuit
compares the voltage at each constant current sink input
against a reference voltage. To ensure maximum power
efficiency, the most appropriate switching mode (1x and
2x) is automatically selected.
The AL3158 requires only three external components: one
1µF ceramic flying capacitor (C1) for the charge pump, one
2.2µF ceramic input capacitor (CIN), and one
2.2µF ceramic charge pump output capacitor (COUT).
The each output channel of the AL3158 can drive three
groups of three individual LED channels with a maximum
current of fixed manufacture setting (20mA or 30mA) per
channel. These can be paralleled to give a total output
current of 270mA.
EN<3:1>
LED ON/OFF CONTROL
XX0
XX1
X0X
X1x
0XX
1xX
LED1~LED3 OFF
LED1~LED3 ON
LED4~LED6 OFF
LED4~LED6 ON
LED7~LED9 OFF
LED7~LED9 ON
Short-Circuit Protection
Short-circuit protection function is incorporated to prevent
excessive load current when either flying cap terminals or
output pin electrically tied to a very lower voltage or
ground.
Over-Voltage Protection
Over-Voltage Protection function is incorporated to limit
the output voltage under a safe value to avoid on-chip
device breakdown.
Under-Voltage Lockout
Under-Voltage lockout feature disables the device when
the input voltage drops below UVLO threshold.
When the die temperature exceeds the thermal limit, the
device will be disabled and enter stand-by mode. The
operation resumes whenever the die cools off sufficiently.
PWM Dimming Control
Unused current channels must be disabled by connecting
the sinks to VOUT with only a small sense current flowing
through the disabled channel.
Document number: DS35047 Rev. 2 - 2
Soft-start is incorporated to prevent excessive inrush
current during power-up, mode switching, and transitioning
out of stand-by mode.
Thermal Auto Shutdown
Disabled Current Sinks
AL3158
Soft-Start
The AL3158 provides simple PWM dimming control
through ENx pins, and the current is adjusted by the duty
cycle of the signal applied on ENx pin. The recommended
PWM frequency is from 200Hz to 50KHz depending on
applications.
6 of 10
www.diodes.com
January 2011
© Diodes Incorporated
AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
Ordering Information
AL 3158 FS G - 7
NEW PRODUCT
Package
FS : QFN3030-20
Device
AL3158FSG-7
Notes:
Package
Code
FS
Green
G : Green
Packing
7 : Tape & Reel
7” Tape and Reel
Quantity
Part Number Suffix
3000/Tape & Reel
-7
Packaging
(Note 7 and 8)
QFN3030-20
7. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf
8. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html
Marking Information
(1) QFN3030-20
(Top View)
XX
YWX
AL3158
Document number: DS35047 Rev. 2 - 2
XX : B8 : AL3158
Y : Year : 0~9
W : Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week
X : A~Z : Green
Part Number
Package
Identification Code
AL3158FSG
QFN3030-20
B8
7 of 10
www.diodes.com
January 2011
© Diodes Incorporated
AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
Package Outline Dimensions (All Dimensions in mm)
0.15 Typ.
Package type: QFN3030-20
CL
0.10 C
B
2X -
0.25 A
Side View
C
2.95/3.05
A
10
1.70/1.90
Pin1
1.70/1.90
0.30/0.40
5
2.95/3.05
NEW PRODUCT
0.05 Max.
Seating Plane
0.57/0.63
0.08 C
Pad Layout Top View
15
(Pin #1 ID)
2X-
0.25 B
20
0.40
0.16/0.26
0.10
C A B
0.595 Typ.
Bottom View
AL3158
Document number: DS35047 Rev. 2 - 2
8 of 10
www.diodes.com
January 2011
© Diodes Incorporated
AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
NEW PRODUCT
Taping Orientation (Note 9)
Notes:
9. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf
AL3158
Document number: DS35047 Rev. 2 - 2
9 of 10
www.diodes.com
January 2011
© Diodes Incorporated
AL3158
HIGH EFFICIENCY 1x/2x CHARGE PUMP
FOR WHITE LED APPLICATIONS
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS
DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
NEW PRODUCT
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other
changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability
arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any
license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described
herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies
whose products are represented on Diodes Incorporated website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized
sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall
indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names
and markings noted herein may also be covered by one or more United States, international or foreign trademarks.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without
the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided
in the labeling can be reasonably expected to result in significant injury to the user.
B.
A critical component is any component in a life support device or system whose failure to perform can be reasonably expected
to cause the failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or
systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements
concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems,
notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further,
Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes
Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2011, Diodes Incorporated
www.diodes.com
AL3158
Document number: DS35047 Rev. 2 - 2
10 of 10
www.diodes.com
January 2011
© Diodes Incorporated